Cylinder construction for air-cooled engines



July 23, 1929. MURPHY 1,721,870

CYLINDER CONSTRUCTION FOR AIR COOLED ENGINES Filed Feb. '24, 1926 1 NVEN TOR.

A TTORNEYS Patented July 23, 1929.

UNITED STATES wisp rarest" orFIcE.

RALPH MURPHY, 0F SYRACUSE, NEW YORK, ASSIGNOR, IBY MESNE ASSIGNMENTS, TO

FRANKLIN DEVELOPMENT CORPORATION, OF SYRACUSE, NEW YORK, A CORPORA-TIQLN OF NEW YORK.

CYLINDER CONSTRUCTION FOR .AIR-COOLED ENGINES.

I Application filed February 24, 1926. Serial No. 90,390.

This invention relates to air cooled engines and particularly to meansby which the cooling of the engine by an air current is greatlyfacilitated.

The invention consists in the novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanyingdrawings in which like characters designate corresponding parts in allthe views.

Figure 1 is a fragmentary plan view of the air cooled cylinder embodyingmy invention.

Figure 2 is a fragmentary vertical sectional view.

Figure 3 is a fragmentary side elevation of parts seen in Figure 1.

Figure 4 is a view similar to Figure 3 show ing an inverted arrangementof the deflectors.

Figure 5 is a view similar to Figure 1 showing a modified form of myinvention.

Figure 6 is a vertical sectional view similar to Figure 2 of theembodiment of my invention shown in Figure 5.

This engine construction comprises, generally, a cylinder provided withmeans forming lengthwise air passages, that is passages extendinglengthwise of the cylinder including heat radiating flanges, the flangesbeing provided with projections or deflectors which cause the aircurrent to be deflected out of its otherwise straight course through thepassages and take a tortuous path or to pass in a direction transverselyof the lengthwise passages, these projections being arranged lengthwiseof the fins from top to bottom and staggered.

1 designates the cylinder, and the means for forming the lengthwisepassages in addition to the fins or lengthwise flanges.

2 comprises a jacket. The jacket is here shown as formed by angularlybent flanges 3 at the outer edges of the fins, each flange 3 projectingtowards the fin 2. The jacket may be formed in any suitable manner.

4 are the deflectors, here shown as struck from the flanges 2, which areusually of sheet metal attached to the cylinder in any well knownmanner. They are here shown as having their inner margins embedded inthe cylinder, the embedding being accomplished by casting the cylinderin a mold around the margins of the flanges extending in the mold,

Preferably the forming of the deflectors 4. also form passages orperforations 5 extending through flanges so that the air deflected inthe lateral direction can pass from one lengthwise air passage 6 to theother 7.

In Figures 1, 2 and .3 the deflectors are shown as inclined downwardlyso as to deflect the air from one side of any one air passage toward theother side thereof.

In Figure 4 these deflectors 8 are shown as arranged as incliningupwardly and laterally in order to scoop the air through theperforations 9 from one lengthwise air passage to the other. InFigures-5 and 6 the deflectors are shown as projections or bosses 10.These bosses 10 are preferably round and serve to obstruct the air anddeflect it in its passage through the lengthwise air passage so that theair will absorb maximum heat from the flanges. The staggered arrangementof the deflectors 4, 8 or 10 as here shown is brought about by locatingthe deflectors in pairs and locating a single deflector between thepairs out of line with the members of each pair as seen in Figures 2 or6.

By my invention intimate contact between the air current and the flangesand the jacket is brought about, which results in the absorption by theair of maximum heat from the heat radiating flanges or the jacket andhence in maximum cooling of the cylinder.

What I claim is 1. A cylinder construction for air cooled engines havingmeans for forming air passages extending lengthwise of the cylinderincluding heat radiating fins extending lengthwise of the cylinder thefins being formed with deflectors spaced apart at intervals lengthwiseof the fins, the deflectors of each fln being arranged staggered.

2. A cylinder construction for air cooled internal combustion engineshaving means for provinding air passages extending lengthwise of thecylinder including heat radiating flanges, the flanges being flat stripsprovided with inclined deflectors struck therefrom and means at theouter edges of the flat strips for forming a jacket.

In testimony whereof, I have hereunto signed my name, at Syracuse, inthe county of Onondaga, and in the State of New York, this 9th day ofFeb, 1926.

, RALPH MURPHY.

